Operating mechanism for ventilators



March 10. 1925- T. J. CALLAHAN OPERATING MECHANISI FOR VBNTILATORS Filed Aug. 20, 1923 M; ATTORNEY Patented Mn. 10, 1,925. I

UNITED STATES 1,529,642 PATENT OFFICE.

THOIAS \T. CLLLAEAN, OI DAYTON OHIO, ABSIGNOB TO THE '1. J. rm, OI DAYTOK, 0810, A CORPORATION 01' OHIO.

orm'rme Wills! FOB VENTILATOBS.

Application fled August 20, 1823. Serial No. 858,227.

I To all whom it may concern:

Be it known that I, THOMAS J CALIA AN, a citizen of the United States, residing in the city of Dayton, in. the county of Montgomery and State of Ohio,-have invented certain new and useful Im rovements in Operating Mechanism for 'eentilators, of which the following is a specification.

It is the principal object of my invention to provide for ventilators and like structures, an operating mechanism comprising a segmental rack and pinion constructlon which is adequately flanged and one in which friction is reduced to the minimum.

It is another object of my invention to provide flanges on the pinion which not only reinforce its teeth, but which tend to hold it, the rack and the yoke pieces in such upright relation to each other that side strains and attendant friction are materially reduced.

' In the accompanying drawings, Figure 1 is a side elevational view of my doubleflan ed pinion operating mechanism ap p lie to the ventilating sash of a building.

igure 2 is a. side elevational view of the double-flanged pinion between the yoke pieces and the segmental rack. Figure 3 is a cross sectional view taken through the same on the line 3-3 of Figure 2. And Figure 4 is a side elevational view of the pinion, partly broken away and in section to show how the teeth are reinforced by the flanges on it.

Throughout the specification and draw.- ings, simllar reference characters denote corresponding parts.

Referrin to the accompanying drawings" for a' detai ed description of my invention, the numeral 1 designates a roof to the beam 2 at the angle of which there is hingedly secured a ventilating sash 3. Secured to a rafter 4 is an arm 5 1n the lower end of which a shaft 6 is suitably journaled and adapted to be rotated by a crank or other means not shown. (See Figure 1.)

Fixedly secured to the shaft 6 by means of a screw bolt 7 is a sleeve pinion 8 which is preferably a casting formed like a hub, tapering at one end and having an annular recess 9 formed in its outer peri hery near its other end. (&e Figure 3.) I rejecting outwardly from the casting on each side of the recess!) is an annular'flange 10. Formed around, and integral with, the bottom of the recess 9 between the annular flanges 10, 10,

'said are radial pinion teeth 11 which do not extend quite to the outer circumferentialedges of the latter. By these flan cs 10, 10 the teeth 11 are adequately, rein orced for engagement with the teeth of a se ental rack 12 that is pivotally secured at 1ts outer end to the ventllatin sash 3.

Surrounding 51s hub of the pinion 8, one on each side of its double'flanged portion, are the curved arts of two flat metal yoke ieces 13, 13 which, beyond the flanges, taper inwardly to the plane of them, and then project outwardly in parallelism a suflicient distance to permit the rack 12 to move freely between them. At their free ends the two yoke pieces are connected by pintles 14, 14 onwhich are mounted rollers 15, 15 respectively, which, when they are engaged by the upper curved surface of the rack, offer a minlmum resistance to. its longitudinal movement. (See Figures 1, 2 and 3.) The lower curved portions of the yoke pieces are connected by a spacing pin 16.

When the construction is assembled, the annular flanges 10, 10 on, the pinion 8 will straddle the toothed portion of the segmental rack 12 with which its teeth 11 are in engagement, and will rotate freely between the curved portions of the yoke pieces 13,- 13 whose outerends also straddle the rack. The pinion, therefore, by virtue of its double flanged hub will serve to maintain the rack and yoke pieces in proper upright relation to it, not only to prevent it from jumping ofi the rack but'also to minimize side strains and reduce friction to the minimum. The flanges 10, 10 not only contribute to an easy and safe operation of the device, but they also serve to reinforce the pinion teeth for a strong engagement between them and the teeth of the segmental rack. Since the hub, the flanges and the teeth of the pinion are made in one iece, the construction of the device is sim ified without subtracting from the manifo 'd advantages efl'ected.

' Having described my invention, I claim:

1. In a'device of the type described, a pinion, a segmental rack in engagement with inion, a pair of yoke pieces whose curve ends surround saidpinion and between whose outer ends said rack is longitudinally movable, restrainin means between the outer ends of said 0' e pieces for en agement by the rack,.an a pair of ann ar flanges on the pinion, one on each side of its teeth, to'reinforce the latter and to straddle the teeth on the rack and freely rotate between the curved portions of the yoke pieces, for the purpose specified.

2. In a device of the type described, a pinion having an elongated hub, said pinriphery of its hub, an annular flange projeoting outwardly from said-hub on each side of the annular recess therein, teeth formed integrally around the bottom of said recess between said flan es, a segmental rack in engagement with said teeth, a pair of yoke pieces whose curved ends surround ion having an annular recess in thenuter pe- "curved portions of the said pinion and between whose outer ends 15 the rack is longitudinally movable, and restraining means between the outer ends of -said yoke pieces for engagement by the rack,

the flanges on the pinion straddling the latter and freely rotatable between the yokepieces, for the purpose specified. I t

In testimony whereof I have hereunto set my hand this 17th day of August, 1923. p

THOMAS J. CALLAHAN. Witness: I

HOWARD S. SMITH. 

